<mat-toolbar class="df jcsb">
  <div>eh</div>
  <button mat-button (click)="doLogout()">退出</button>
</mat-toolbar>
<mat-toolbar color="primary">
  <button mat-icon-button>
    <mat-icon>menu</mat-icon>
  </button>
  <!-- <ng-content></ng-content> -->
</mat-toolbar>